Co-C烧结体的高温高压相变研究  

Study on phase transition of Co-C sinter prepared by high temperature and high pressure

作　　者：贾洪声[1] 鄂元龙[1] 谭莹莹[1] 周成[1] 李海波[1] 贾晓鹏[2] 马红安[2] 郑友进[3] 

机构地区：[1]吉林师范大学功能材料物理与化学教育部重点实验室,吉林四平136000 [2]吉林大学超硬材料国家重点实验室,吉林长春130012 [3]牡丹江师范学院新型炭基功能与超硬材料省重点实验室,黑龙江牡丹江157011

出　　处：《超硬材料工程》2013年第5期29-32,共4页Superhard Material Engineering

基　　金：国家自然基金项目(20971055);四平市科技发展计划项目(2012037);吉林大学开放课题(201201);牡丹江师范学院开放课题(201301)

摘　　要：在高温高压（4~5 GPa,600℃~900℃）条件下,以钴、石墨微粉作为原料,制备了 Co-C 烧结体,借助 XRD 考察了不同实验参数（温度、C 掺杂量、压力等）对 Co-C 相变的影响,结果表明：C 掺杂量为1~5 wt %的范围内,随着掺杂量的提高,Co 发生从六角密堆（α-Co 相）向面心立方结构（β-Co 相）转变的临界温度降低；温度的升高有利于 Co-C 的固相烧结反应,β-Co 相随之增多,而压力的升高对α-Co向β-Co 转变有抑制作用,相变的临界温度也随之提高。The Co-C sintered body was prepared using cobalt and graphite powders as start-ing materials under high temperature and high pressure （4 ~5GPa,600 ~900℃）condi-tions.The effect of the experimental parameters （temperature,C-doped content and pressure）on the phase transition of Co was investigated by means of XRD.The results show that the transformation temperature of Co from the structure of hexagonal close-packed （α-Co ）to face-centered cubic （β-Co ）decreases with the increase of C-doped content in 1~5wt.%,and the increase of temperature is in favor of Co-C sintering reac-tion as result of the increasing of β-Co phase.However,the pressure increasing has an inhibitoryeffect to the phase formation from α-Co to β-Co,and the critical temperature of the phase transition increases.

关 键 词：高温高压 相变 

分 类 号：TQ164[化学工程—高温制品工业]